Scientists Discover Protein That May Help Regrow Cartilage and Prevent Arthritis
Scientists at Stanford University have discovered that age-related cartilage loss may be driven by a single protein, a finding that could eventually lead to new treatments for arthritis and help older adults maintain mobility.
The protein, called 15-PGDH, increases naturally as people age. Researchers already knew that it interferes with the body’s ability to repair tissues and control inflammation. This led scientists to investigate whether it also plays a role in osteoarthritis, a condition in which cartilage breaks down, causing joint pain, stiffness, and inflammation.
In experiments on older mice, researchers found that damaged knee cartilage became thicker after the animals were treated with a drug that blocks 15-PGDH. In younger mice with joint injuries, the same treatment protected the cartilage from the damage that normally leads to osteoarthritis. Even when researchers simulated serious knee injuries, such as ACL tears, mice treated with the inhibitor did not develop arthritis.
Unlike earlier cartilage repair methods that relied on stem cells, this new approach worked without them. Instead, the treatment improved the function of chondrocytes—the cells already present in cartilage—by restoring them to a healthier state.
According to Stanford scientist Helen Blau, this represents a completely new way of regenerating adult tissue. She explained that the discovery was unexpected because the researchers initially believed stem cells would be required for cartilage repair.
The treated mice also showed clear physical improvements. They walked more steadily and placed more weight on injured legs, suggesting reduced pain and better joint function. Similar results were seen in experiments on human cartilage taken from patients undergoing knee replacement surgery, where the tissue showed signs of regeneration and reduced inflammation.
Another researcher, orthopaedic scientist Nidhi Bhutani, noted that the treatment works by changing how existing cartilage cells express genes, rather than replacing them. This approach could have a much larger impact on future clinical treatments.
While more research is needed, including human clinical trials, this discovery raises the possibility of treatments that address the root cause of osteoarthritis rather than simply managing pain. In the long term, it could reduce or even eliminate the need for hip and knee replacement surgeries.
The study was published in the journal Science, and earlier trials of similar drugs have shown no major safety concerns, increasing optimism about future applications.
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